Where: Nei Mongol, China (43.1° N, 111.6° E: paleocoordinates 44.2° N, 103.7° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Arshanto Formation, Early/Lower Eocene (55.8 - 48.6 Ma)

• sampled horizons probably correspond to layers 4–6 of Qi’s stratigraphy (1987: pp. 8–10), which has a maximum thickness of 25 m in Bayan Ulan.

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: mesofossils

Collected by T. Smith, Dian-Yong Guo, Pei Jie Ning, G. Lenglet, E. Dermience; reposited in the IVPP

Collection methods: surface (float),

• hand picked from surface of approx. few hundred meters in diameter

Primary reference: M. Paepen, H. Li, Y. Sun and T. Smith. 2021. A late early to early middle Eocene mammal assemblage from Bayan Ulan (Inner Mongolia, China): Implication for the reassessment of the Arshantan Asian Land Mammal Age . Geobios 66-67:177-191 [P. Holroyd/P. Holroyd]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 226243: authorized by Patricia Holroyd, entered by Patricia Holroyd on 26.06.2022

Creative Commons license: CC BY (attribution)